Support atomic modesetting ioctl

Add support for the atomic modesetting ioctl through a property-set API.

v1: Squashed intermediate patches from Ville, Rob and myself. Updated
    for current kernel interface (no blobs).
v2: Rewrite user-facing API to provide transactional/cursor interface.
    Use memclear to zero out ioctl.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rob Clark <robclark@freedesktop.org>
Signed-off-by: Daniel Stone <daniels@collabora.com>

v3 [Emil Velikov]: Remove DRM_CAP_ATOMIC - superseded by
DRM_CLIENT_CAP_ATOMIC.
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

2 files changed, 24 insertions, 0 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index 229a29f9..d1dc3e38 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -635,6 +635,13 @@ struct drm_get_cap {
  */
 #define DRM_CLIENT_CAP_UNIVERSAL_PLANES 2
 
+/**
+ * DRM_CLIENT_CAP_ATOMIC
+ *
+ * If set to 1, the DRM core will allow atomic modesetting requests.
+ */
+#define DRM_CLIENT_CAP_ATOMIC           3
+
 /** DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */
 struct drm_set_client_cap {
         __u64 capability;
@@ -758,6 +765,7 @@ struct drm_prime_handle {
 #define DRM_IOCTL_MODE_OBJ_GETPROPERTIES        DRM_IOWR(0xB9, struct drm_mode_obj_get_properties)
 #define DRM_IOCTL_MODE_OBJ_SETPROPERTY  DRM_IOWR(0xBA, struct drm_mode_obj_set_property)
 #define DRM_IOCTL_MODE_CURSOR2          DRM_IOWR(0xBB, struct drm_mode_cursor2)
+#define DRM_IOCTL_MODE_ATOMIC           DRM_IOWR(0xBC, struct drm_mode_atomic)
 
 /**
  * Device specific ioctls should only be in their respective headers
diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h
index a2ab88a5..66f856fc 100644
--- a/include/drm/drm_mode.h
+++ b/include/drm/drm_mode.h
@@ -507,4 +507,20 @@ struct drm_mode_destroy_dumb {
         __u32 handle;
 };
 
+/* page-flip flags are valid, plus: */
+#define DRM_MODE_ATOMIC_TEST_ONLY       0x0100
+#define DRM_MODE_ATOMIC_NONBLOCK        0x0200
+#define DRM_MODE_ATOMIC_ALLOW_MODESET   0x0400
+
+struct drm_mode_atomic {
+        __u32 flags;
+        __u32 count_objs;
+        __u64 objs_ptr;
+        __u64 count_props_ptr;
+        __u64 props_ptr;
+        __u64 prop_values_ptr;
+        __u64 reserved;
+        __u64 user_data;
+};
+
 #endif